

   
\begin{tikzpicture}[scale=2.54]
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\dpicdraw (0,0.625)
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\draw (-0.125,0.5) node[left=-1.5bp]{$ v_{s}$};
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\draw (2,1.491667) node[above=-1.5bp]{$ 50~\Omega$};
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\draw (3.2,1.491667) node[above=-1.5bp]{$ 100~\Omega$};
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\end{tikzpicture}
